"Clicksor is one of the current leaders of the small publisher Adsense competition. They have payouts upto a market leading 85% and unlike a number of alternatives the cost per click bid values are high enough that you can earn a decent income. They are also, in my experience, much more tollerant than Google. Their terms and conditions suggest that you should only place one copy of their code on a page but as long as you only place a single pop-up or DHTML code on a page they seem happy to let you place many context sensitive ad blocks on a single site."
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